Elastic suspension for electric lamps and the like



J. VOSS ELASTIC SUSPENSION FOR ELECTRIC LAMPS AND THE LIKE Filed Feb. 25, 1930 y Patented Feb. 23, 1932 :01m voss, or aL'roNA-osnonr, Gamm mm() SUSPENSION FOR ELECTRIC LAMPS AND TEE LIKE Application Med Iebruary 85, 1930, Serial No. 431,216, and 1n Germany lay 24, 1927.

Suspension devices vfor electric lamps are known, which are fixed to the covering and the relieving or the supporting thread of a conducting wire arranged thereunder for the purpose of protecting the vconductor wires and their insulation against pull and thrust stresses and to prevent their becoming damaged. These known suspension devices consistl of a cone provided with a cylindrical 1n bore and designed to be pressed into a conically bored sleeve by means of a cap nut. In order to connect the known suspension devices to the conductor Wire, the conductor wire is threaded through the cylindrical bore of the cone and the free end of the covering of the conductor and its relieving or supporting thread are bent back over the lower edge of the cone, whereupon the cone is pressed by a cap nut into the conically bored sleeve after the conductor leads have been threaded therethrough with their insulation, the coverin and the relieving or supporting thread of te conductor wire arranged thereunder, being clamped between the superposed surfaces of the cones. The result is that the current conducting wires, together with their insulation are freed from ull or thrust stresses so that they are not loa ed by the lamp socket with the lamp shade and bulbs and are not I0 clamped between the cone and conical sleeve. These known suspension devices are however open to the objection that the covering and the relieving or su porting thread can be def stro ed or crushe by the pressing together of t e cone and conical sleeve so that a reliable relieving of the current conductor wires with their insulation is questionable.

The suspension device according to the invention, consisting of a suspension for electric lamps and the like which is fixed on the covering and on the relieving thread of the conductor arranged thereunder, differs from the known suspension devices by its particularly practical construction, the main features of which are that a metal sleeve ribbed on the outer side is inserted under the covering and relieving thread of the flexible cord and a rubber sleeve di awn tnereover, which presses the covering and the relieving thread tightly against the metal sleeve at the tightening of a screw piece (nipple and cap nut?.

This construction offers the consideraba technical progress, that the parts of the iexible cord to be clamped namely the covering and the supporting thread lie protected between a rubber sleeve and a metal sleeve, so that they cannot be damaged by the pressure caused by the tightening of the screw piece. Consequently a reliable relieving of the currentlconducting wires, and insulating material 1s obtained besides an elastic resiliently acting connection between the lamp or the like and the exible cord.

An embodiment of the invention is illustrated by. way of example in the accompanyinv drawings in which:

lfig. 1 shows the suspension in vertical section,

Fig. 2 is a cross section of the suspension.

The iexible cord consists of the current 'conducting wires It, z', which are embedded 1n an envelope a of elastic material. The envelope a is surrounded by a spun covering b. Between the covering E end-the envelope a is a known relieving or supporting thread g.

The covering a is guided in a metal sleeve yc ribbed on the outer surface, which is pushed under the covering t and the relieving thread g. The covering and relieving thread g are enclosed by a rubber sleeve fil., which is compressed by screw threaded clamping elements e, f. The free end of the covering and of the relieving thread g are laid on the end face of the rubber sleeve b and clam )ed by a flange .it of the metal sleeve c when t e screw threaded elements e, i are tightened. Consequently the portion of the rubber sleeve d in the screw threaded elements e, is compressed in axial direction and there ore bears tightly against the ribbed metal sleeve c so Y that the ribs press into the rubber sleeve and consequently clamp the covering b with relieving thread g arranged over the metal sleeve c, so that it is impossible to pull oi from the cable covering a the rubber sleeve d with the sleeve c by exerting a pull onto the screw threaded elements e, f, in spite of the fact that the covering e is freely movable and always free from pressure in the metal sleeve c and in the part'of the rubber sleeve d projecting from the screw threaded element e.

I claim:

An elastic suspension devices for electric lamps and the llke, comprising in combination with a` covering and a relieving thread of the exible cord under said covering, a* metal sleeve ribbed on the outer surface adapted lto be pushed under said covering and said relieving thread of said flexible cord, a rubber sleeve adapted to be slip ed over said covering and sald relieving t read, a tubular clamping element with external thread adapted to be attached at one end to the pendant and a second cap shaped clam ing element adapted to be screwed onto tlile other end of said tubular element and to press said rubber sleeve, covering and relieving thread ti htly against said metal sleeve.

n testimony whereof I aiix mysignature.

JOHN VOSS. 

